Pile-wire knife



Patented July 1.926.. y

' meagre "o FF-lcnii QIMMANUEI; Prnirrnn, lorBEDFORD,f'llctAssACHUsnTtrJS5)Assuntore,isijfijrianoil `Arto V4MESNE ASSIGNMENTS, To BLUE Tiry PILEWIBE, a; 'KNTFE 'CoMPANYjoF Bnnnonn, MASSACHUSETTS A CORPORATION oF MASSACHUSETTS, f y

` This'invention lrelates a pile-Wire Yknife having novel means providing for removal the blade-homer.

The inventionmnl be .best understood by;

reference `to the following description, `when taken inconnection with the accompanying drawingsypf onespecic vembodiment there- 0,`.While-it's sco-pefwill be more particularly pointedy Outih'the appendedclams g v Inthedmwngsgq A 4 Fig 1 is angelevation of apile-vv'ireknife` exemplifyingthe invention; f v "'Fig. -2 iis anA elevation yof the same, as viewed from theoppo'site side thereof;

. 1'Fig.f3 is' an elevation, partly in section,

y illustrating the niod'eof attaching and dejvtaching the blade;

' r Fig. 4; is al sectional' vievv, onlineii ioFigl; y,; ,i t Fig. 5 is a sectional view, on line 5-5 of Fig. 1; and L j..Fig. 6 is a-sectional view, on an enlarged scale,-on.li ne 6,-64ofFigg3- 1 f i A Reerring-to thefdravvings, and totheembodiment of the invention Whichis selected foreXeI'nplilication, there fis shown a pile-` Wireknife, `comprising alblade Tand abla'de- -holderfvSt Herein, the blade has a'tapered formation, it having anar-row rear Yend 9 andza Wide forward endrlO v The terni for- -Wa-rd. asherein employed in connectionvvith.

blade which iszat Vthe rear `during the for- Ward stroke of the free end 'sof theknife acrosst-hefabric. 1 The bladeV is` provided with :al-,cutting edge 11, which, duringfthe f zrearwardfstroke o-fthe' Wire, cuts the loops f ",ff'The blade-holder hereinrr'is .conveniently formed ofsheet metal folded upon itself to :provide `tvvo Walls 12=and 13, between which 'isga vgroove 14 to receive' theblade.' Herein,

.the wall- 'U13 extends Ilongitudinally beyond PILE-WIRE KN1FE.

pplicationled- April '14, l19225. Serial No.`2'3,`03. 1

holder, andl isw'cyornpletely;concealed by fthe. .'Wallswhlch presentthe-groovelforthe reofshe-bla'de-froin, and lts replacement 111 ception-,ofl thevbladeq-Y The rear end ,of the blade is retained inthe 'groove byy an, abutiny Figs. y1 and 2 can be; accomplished only by svving'ngthefblade onjthe-abutr'nenn'sas:

i a I fulcr'urn (see Fig. 3,) .1 Inasmuchyas 'the`r` fulcruln is at therearlendoftheblade, this construction may beernployed in ,connection V lWith narrowerlwires,,because evenx Withthe y narrovvest Wires,)the.head"at the'forward end "i can be made suilicientlyvwidetocarry means -toretain they forward-, end ofy the blade .inthe groove, in themanner presently tobe-'describedf `In the present f example, the abut.

ment 17 is-conveniently.presentedby al strip '1 of InetaLvvhich is inserted in the groove 14,

and is secured in place Aby forining oneor more indentations 18 (one ofwhich 1s Shown in section in Fig.y 6) inone ofthel sidewalls I of the l-holder, thereby squeezingsuchawall `into lthe l stripA which is interposed between the vvalls, yand thus securely .holding the/saine vThe forwardendoi blade islret'ained t in the groove` by the cooperative action of =a protuberance` v19,- presentedby' the-Walld n and a Wall 20, jwhichi n the presentexample, is conveniently formed asffa tongue struck -While the protuberance 19fpresents Kanvobstruction to,y Withdrawal ofrthe; blade from the 'groove by swinging-movement on nits ulcruin 1'( @The Wall; 2Qis .,resiliently re- -lated" to.tl1e Wall;15,vit being inthefomn of y'a'spring tongue l(see,Fig..5), which isadaptl edtoA recede from: the'gvva'll 15, when sulicient pressure is exerted? against.:l the blade in its ',own" plane .toward the prohibe-rance 19, the

latter being ronndd'aor .vbeveled,g to permit 'l `tlne blade toride overvit.l When the blade Fis in place;thisftonguegresists lateral move- "inent of; the` blade, and` accurately positions the latter With reference to theopposite Wall,

results `in accurate cuttingof theloops. and

irrespectivev ofthe/,Width-fofthe groove lwith i reference tofthethicknessoffthe blade-..1y This f .in'nniformappearance'of'vfthe Work. -When l Avthe blade 4is lin place, the "tongue 20 rc'onsti- "j tutes an abutment, -whichdeiinesthe posiand is operated in a manner too well lrnown `to those skilled in the art to require description. W'hen the blade becomes dulled, it may;

be removed and replaced by a sharp one, with the greatest facility, and-whenrin place, is securely locked against accidental disengageinent from its holder.

HavingY thus described-l one embodiment of v the invention, but without limiting 'myself thereto, what-Ii claim and desireby'Letters Patent to -secure isaw! l. A pile wire-'knifecomprising, incombination, aiblade, and afbllade--holder having two' wall-s presenting a groove which receives a longitudinal edgmaI of? said blade, bladeretainingzmeans presenting a fulcrum on-vwhichthefrean end' of'said blade swings in attaching it: to and detachingitI from said holder, means toresistf forwardl movement of said' blade; with relationI to saidholder, and blade retaining means comprising a protfuberance presented by one ofi said walls and,l affording an obstruction forwardv of saidf'ul'crum andrwithout the perimeter of saidb'ladetofresisti removal ofthe latter.

f 2. A\ pilewire knifecomprising, incombination, a blade anda blade-holder having two walls presenting a groove which receives@y alongitudinal evd-gev of' said blade, blade retaining:means presenting a fulcrum on: which therear end A offsaid blade swings in attachingfit to'V and detachin-g-v it,` from said holder, means to resist forward' move'- 'ment' offY saidblade with relation tor said holder, and blade retaining: means-.comprising ay beveled .-'protuberance presented byvone offsaid walls and disposed'with'out the per iineter of said blade in.l positionolbe engaged by another longitudinal edge f ofi said blade.

3i A pile-wire knife comprising, in combination, a blade, and'a blade-holder` having two walls presenting agroove which receives a longitudinaledge of said blade, blade*retainingmeansepresenting a fulcrum on'which one end of s-aidbl'adef swings in attaching'it 4tov and d'etachingv it-I from said holder, andv bladeretainingfmeansl comprisingan obstructiom in ther path of" another longitudinal'edgeof said blade,` and yielding means normallyy to ret-ainsaid blade inthe plane of said obstruction. and adapted to yield to permit said blade l. tof becomel displaced from-.saidlplane landto-.pass over ysaid. obstruction. l

4.' A' pile wire| knife comprising, in combination, ablade-havingranarrow endiand a wide end, and? a blade z holder presenting' a groove which receivesvoneedge lofY saidA blade,

an abutment'which. overhan'gs said narrow' end and retains -therlatter inwsaidfgroove,iand

twov walls which embracen said wideend, one of said walls being resiliently related to the other and the latter presenting a protuberancefwhich normally retainsvsaid wide end in said groove by engagement with alongL tudinal edge ofsaidblade.

5. A pile wire knife, comprising, income bination, a blade, and a blade-holder presenting a groove which receives one edge of saidbla'de, anabutment which overhangs one portion of said blade and retains such portion vin said f groove, andtfwov walls which. embrace another: portion of.s said blade, one` of said. walls4 bei-ng resiliently relatedA ton the other and the latter presentingaprotubere ancey which normally. retains such fothere. v`portion of saidblade insaid groove byrengage ment with a.longitudinaliedgepfsaid blade;

6. A pilewire knifecomprisingincombination, alblade,and a blade holden-having a shankl presenting: agroove which receives one edge of said blade,- an. abutmentlwithin said: groove, which .overhangs one portion of said blade and retainssuch.portioniinlsaid groove, and a head' presenting.: two Walls which embrace another; portionA olf-'i said blade, one of said walls being4 resilientlyfrelatedto the other and tliellatter;r presentingfa beveled protuberance which.nonmallysretains suoli portion. ofy saidfbladewin said'. groove; by engagement with a longitudinal edgeofsaid blade. f

7. A `pile wire knife comprising, in combination, .a blade, andaibladehollder having two walls presenting v'a groove whichmeceives saidblade, means to retain oneyend-vofsaid bladein said? groove,` and means to; retain the other end of said blade saidgroove, the. last-mentionedl means. including. Y a..yieldL ing tonguey and a: beveled .protuberanceipresented byone-of said walls.V

8. Arpile wire-knifecomprising,Y inl combination, a blade, a bladeehol'der havingf'tlwo walls: whichv embrace said blade,V andv bla-'de retaining,` means'` including a. beveled protufberance .presented by one ofxsaids walls: and presenting an obstructionto removal-.offsa-id blade, and alaterally resilientx tongue which yieldingly resists movement ofsaid blade from such wall. f

9. A pile wire knife comprising; incombination, a blade, abladeholderf havingftzwo walls which embrace said blade,-one of said walls extending both laterally and longitudinally beyond the other; andi presenting a protuberancewhich resists.outwardfmove ment-of said bladefrom saidy groove,2 andfa laterally resilient tongue which yieldingly resists movement; of;y said; blade froml such extended wall.

l0. A" pile wire'knife comprisin in-zcombination a blade., and" a bladeeho` den having'two walls presenting; a groove whichreceivesv a longitudinali edgey Ofi said; blade, blade-retainingl means comprising a. fulerum on whichA the rear end of said blade swingsv on which the rear end of said blade swings in attaching it to and detaching it from said holder, and laterally-resilient means pre-r senting at the forward end of the blade an abutment which receives the ylongitudinal thrust of said blade in a forward direction and which yieldingly resists lateral move nient of said blade.'

ll. A l'pile wire knife'comprising, in combination, a blade, and a blade-holder having two walls presenting ja groove which receives a longitudinal edgev of said blade,

blade-retaining means comprising'a fulcrum in attaching it to and detaching it yfrom said holder, and a laterally Aresilient tonguev which engages one face of saidblade, said tongue presenting an obstruction'which re-y y 'ceives the forward thrust of said blade.

l2. A pile wire knife comprising, in com# bination, a blade, and a 4blade holder having two walls presenting a groove which re ceives a longitudinal edge of said blade, and means presenting a fulcrum on which the rear end of said blade swings in attaching it to and detaching it from said holder, one

,e of said walls being extended beyond the other both laterally and longitudinally in a forward direction, said extended portion presenting two protuberances Vone of which is adapted to be engaged by the forward end ofsaid blade to limit forward 'displacement of saidlblade and the other of which is adapted to be engaged by the other longitudinal edge of said blade to limit swinging movement ofr said blade in an outward direction from ,saidy groove, the last-mentioned protuberance beingbev'elled to permit said blade to ride up and overy the same'during removal of said blade.`

13. A1, pile wire knife comprising, in com-: bination, a blade, and a bladeholder having two walls presenting a groove which' re-y ceives a longitudinal ledge of said blade, one Y of said walls V'extending longitudinally in a forward direction beyond the other and having a portion which is *wider` than thel a fulcrum on` ,which the' rear end of said lade swings in.

other, and `means lpresent-in attaching it to` and detaching it from said ward direction on said fulcrum.

In testimony' whereof, I have signed my name to this specification.

ynxnuAiiUiaL PFEIFFER. i 

